2003 freightliner century electrical problems

I have a 2003 Century and I don't know what is causing the problem I have. I had the gps connected to the cigarette lighter as I was driving when the gps just shut off so I pulled over and turned the cabin light on and they started flashing. They only flash when the truck is on and they seem to flash with the sound of the idle of the truck so I plugged in an led bar to the cigarette lighter and it also started flashing at the same time as the cabin lights. At that point I didn't know what to do so I turned the drivers side light on and it also flashed but then it all shut off. The truck still runs and the outer lights still work but no cab lights or cigarette lighter. I checked all the fuses and none of them are blown. I still replaced them and checked for power and none of them have current (cigarette, cab, and another one I can't remember). Any help with this would gladly be appreciated, thanks.

 

is that the computer thats behind the passengers side. If so that computer is the problem so i temporarily bypassed it till my part arrives.

 

yeah sounds way out of my hand so i just did a jumper till i can get the new one but its like $230

 

hahah well it has a freshly rebuild engine and it runs great its just those little computers issues now but other than that it has not failed us but a new one would not be a bad idea lol